81015305 has 8 divisors (see below), whose sum is σ = 111106752. Its totient is φ = 55553328.

The previous prime is 81015293. The next prime is 81015313. The reversal of 81015305 is 50351018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81015305 - 2⁴ = 81015289 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1157327 + ... + 1157396.

It is an arithmetic number, because the mean of its divisors is an integer number (13888344).

Almost surely, 2^81015305 is an apocalyptic number.

It is an amenable number.

81015305 is a deficient number, since it is larger than the sum of its proper divisors (30091447).

81015305 is a wasteful number, since it uses less digits than its factorization.

81015305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2314735.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 81015305 is about 9000.8502376164. The cubic root of 81015305 is about 432.7021207707.

The spelling of 81015305 in words is "eighty-one million, fifteen thousand, three hundred five".